This is what your system at least should have:
·At least 2 MB of free hard disk space for download and additional 10 MB for the installation. Further disk space for temp files is recommended .
·Microsoft Windows 2000 / 2003 or XP
·The NTFS file system is the recommended file system for use with DVD2AVI Ripper(NTFS doesn't have a 4GB file limitation )
·DirectX9 runtime http://www.microsoft.com/downloads/details.aspx?FamilyID=2da43d38-db71-4c1b-bc6a-9b6652cd92a3&displaylang=en
·All-in-one codec pack, for example http://www.free-codecs.com/download/K_Lite_Mega_Codec_Pack.htm